<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <img src="./imgs//loading.gif" data-src="./imgs/1.jpg" alt="">
  <img src="./imgs//loading.gif" data-src="./imgs/2.jpg" alt="">
  <img src="./imgs//loading.gif" data-src="./imgs/3.jpg" alt="">
  <img src="./imgs//loading.gif" data-src="./imgs/4.jpg" alt="">
  <img src="./imgs//loading.gif" data-src="./imgs/5.jpg" alt="">
</body>
<script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.js"></script>
<script src="./jquery.lazyload.js"></script>
<script>
  $('img').lazyLoad()
</script>

</html>